Default variable details

Some of debops.libvirtd_qemu default variables have more extensive configuration than simple strings or lists, here you can find documentation and examples for them.

libvirtd_qemu__configuration

The libvirtd_qemu__*_configuration variables are YAML lists which define the contents of the /etc/libvirt/qemu.conf configuration file. The lists are parsed by the template in order defined by the libvirtd_qemu__combined_configuration variable, which allows modification of the parameters defined in earlier lists by the latter ones.

Each element of the list is a YAML dictionary. The dictionary can specify qemu configuration parameters as dictionary keys and they values as dictionary values:

libvirtd_qemu__configuration:

  - 'min_workers': 5
    'max_workers': 20

  - 'unix_sock_group':    'libvirt'
    'unix_sock_ro_perms': '0770'
    'unix_sock_rw_perms': '0770'

Parameters specified in this way will automatically be configured as "present" in the configuration file to override any "comment" state (see below).

Alternatively, each YAML dictionary can contain a name key, which tells the role to interpret a given dictionary using specific parameters:

name

Required. Name of the parameter to manage. Parameter names can contain alphanumeric characters and an underscore (_) character. See the /etc/libvirt/qemu.conf configuration file for a list of known parameters and their meaning.

state

Optional. If not specified or present, the parameter will be present in the configuration file. If absent, the parameter will not be included in the generated configuration file. If comment, the parameter will be commented out in the configuration file. If ignore, a given YAML dictionary will not be evaluated.

comment

Optional. String or a YAML dictionary with a comment for a particular parameter.

value

Optional. Specify the value of a given parameter. Values can be booleans, numbers, quoted strings or YAML lists of strings; empty variants work as well. If value parameter is not specified, an empty string will be set and the parameter will be automatically quoted.

section

Optional. Specify the name of the section of the configuration file in which the parameter should be placed. Section names and their order are defined in the libvirtd_qemu__configuration_sections variable. If a section is not specified, an unknown section will be automatically selected.

weight

Optional. Positive or negative number that affects the placement of the parameter within the configuration file section. The heavier the "weight", the lower the parameter will be placed; negative numbers make the "weight" parameter lighter therefore it will be placed higher. If weight is not specified, it's set at 0.

Examples

Add custom parameters:

libvirtd_qemu__configuration:

  - name: 'custom_param'
    value: 'custom-value'

Change the section and order of existing parameters:

libvirtd_qemu__configuration:

  - name: 'listen_tls'
    section: 'authn'
    weight: 30

Comment out a specific parameter conditionally:

libvirtd_qemu__configuration:

  - name: 'listen_addr'
    value: '0.0.0.0'
    state: '{{ "present"
               if ansible_distribution == "Debian"
               else "comment" }}'

libvirtd_qemu__configuration_sections

This list defines the sections of the /etc/libvirt/qemu.conf configuration file, as well as their order in the generated file. Each element of the list is a YAML dictionary with specific parameters:

name

Required. Name of the section, specified in the configuration entries as the section parameter. Should be short and recognizable.

title

Required. A short description of the given configuration file section which will be added as a header.

comment

Optional. a string or a YAML dictionary with additional comments about a given section, added after the title.

state

Optional. If not specified or present, the section will be included in the configuration file. If absent, the entire section (including the parameters that belong to it) will be omitted in the generated configuration file. If hidden, the section will be present but the title and section comment will not be included.

Examples

Set a custom list of sections:

libvirtd_qemu__configuration_sections:

  - name: 'section-one'
    title: 'First section'

  - name: 'section-two'
    title: 'Section with hidden title'
    state: 'hidden'

  - name: 'section-three'
    title: 'Third section'